Improvement in chimney-cowls



F. PLAENKER. Chimney-Cowl.

Patented Oct. 7, 1879.

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Witnesses, MM MM- litteram NJPETERS, PMoYo-LmmaRAPHER, WASMINGTDN o c *UNITED STATES PATENT OEEIoE.

FREDERICK PLAENKER, OF BALTIMORE, MARYLAND.

IMPROVEMENT VIN CHlMNEY-COWLS.

Specification forming part of Letters Patent No. 220,414, dated October 7, 1879; application filed April 1, 1879.

To all whom it may concern:

Beit known that I, FREDERICK PLAENKER, of Baltimore city, State of' Maryland, have invented certain new and useful Improvements in Chimney-(Bowls, and I hereby declare the same to be fully, clearly, and exactly described as follows, reference being had to the accompanying drawings, in which- 4 Figure l is a perspective view, and Fig. 2 a top-plan view, of' the device.

My invention has reference to that class of devices in use for inducing or enhancing a draft in chimneys; and it consists in a cowl constructed as hereinafter described, and possessing points of novelty that are made the subject of the claims.

ln the accompanying` drawings, A is a casing, preferably curved at the top, as shown, and having side flanges, b b, adapted to rest upon the top ofthe chimney, where the device is secured by suitable irons C C, driven between the bricks and passing through holes b in the anges b, Where they are secured by nuts b.

At either end of the casin g A is a flange, a., to which a door, D, is pivoted at d. These doors are provided on the inside with perforated lugs e, and are connected by means of a rod, E, attached to the lugs. This rod is of' such a length that when one door is closedthe other is opened, as shown in the drawings. These doors are illustrated in dotted lines as attached at opposite sides of the casin g A, and in inost instances this is to be preferred; but in some cases the doors are attachedon the same side.

The device is secured upon the chimney broadside on to the prevailing wind, which closes one door and opens the other, as will be readily understood.

Whenever, by reason of a building adjacent to the chimney, or other cause, the wind can not come from any particular direction, both doors of the cowl are hinged on the same side of the casing, which is then placed so that the hinged side is to Windward.

The doors remain stationary as long as the wind blows from any particular quarter, and are not caused to swing by every eddy, as is the.case with the vane-cowls.

The doors coact to close the Windward and open the leeward door, and the passage of the wind past theleeward opening induces a stron g draft through the chimney.

The rod E is made of such a length as to open the leeward door to a point back of the side line of' the casing A.

By this construction a change of wind cannot cause a back draft, as the open door will divert the wind away from the opening until the preponderance of' pressure opens the closed door.

That I claim as new, and desire to secure by Letters Patent, is

1. A chimneycowl consisting of an openended casing adapted to cover the chimney,

and provided with laterally-pivoted doors arranged to open to a point back of' the side lines of the casing, and to coact in closing the one to Windward and opening that to leeward, as set forth.

2. In combination with the casing A, the laterally-pivoted doors D, located on the same side ofthe casing, and connected by a rod, E, as described.

3. In combinationtwith the casing A, having perforated side flanges, b, adapted for attachment to the chimney by irons O O, the doors D, having lugs e, and connecting-rod E, substantially as set forth.

FREDERICK PLAENKER.

Witnesses:

R. D. WILLIAMS, JNO. T. MADDOX. 

